Question

Pick a two-digit number greater than 25. Rewrite your two-digit number as a difference of two numbers. Show how to use the identity (x − y)2 = x2 − 2xy + y2 to square your number without using a calculator.
(34-7)^2 = x^2-2xy+y^2

I don't know how to do this.

Answer 1

26

Answer 2

let 34 = x and 7 = y, then use x^2-2xy+y^2 to find the answer

Answer 3

@Vocaloid thanks